Hectograph blanket having a copy mass containing a bile salt



Patented Jan. 30,1945

HEOTOGRAPH BLANKET HAVING A COPY MASS CONTAINING A BILE SALT Robert W. Tatge, Chicago, 111., assig'nor to Ditto,

Incorporafltgjd, Chicago,

., a corporation of No Drawing. Application August 8, 1942, Serial No. 454,122

Claims.

This invention relates to a method of obtaining an improved bond between a plasticized gelaintermediate bonding layer of a drying oil.

A principal object of the invention is to provide a hectograph copy mass which is securely bonded to a drying oil coated backing.

Other objects and advantages of the invention will become apparent as the following detailed description progresses.

Linseed oil and other types of drying oils when applied as a. thin film to a fibrous sheet and after drying to a point where there is just a slight noticeable degree of tack, have the property of adhering tightly to a gelatin mass when the latter is applied as a hot melt and allowed to cool. If, however, this film of linseed oil has not been allowed to dry to the proper degree of tack, or ii it should be allowed to dry beyond day, the bond of the finished hectograph roll may Also there may be spots in the roll where, due to the lack of uniformity of the backing material. the drying oil has penetrated into the fibers, thereby resulting in imperfect bond on these places. This type of imperfection is known as spotty bond. Then too the gelatin mass itself may for reasons of copy brightness, ease of paper stripping, etc., contain added in- The pure bile salts are effective even in smaller quantities than .1%, such as, for example, .05%.

Suitable animal biles include ox-gall (a liquid bovine bile), hog bile concentrates (prepared by Wilson 8: Company, Chicago), and ox bile concentrates.

Suitable bile salts which have been tried and found to work effectively include the following:

Sodium glycocholate Sodium alpha-hyodeoxycholate Sodium alpha-glycohyodeoxycholate Potassium glycoholate Potassium alphaP-glycohyodeoxycholate Potassium desoxycholate Sodium taurocholate Sodium chenodesoxycholate Examples of hectograph compositions which embody the features of this invention are given in the following examples, it being understood that these examples illustrate several embodiments which have given satisfactory results and are not intended to restrict the invention thereto:

Example A I 1 Parts Gelatin 150 Water 224 Glycerin' 1,550 Ethylene glycol 200 Custard (10 parts corn starch, 20 parts glycerin, 20 parts water) a 150 Gluflex 200 Hog, bile solid 10 Example B Parts Gelatin 150 Water Glycerin 1,550

Hercolyn 200 0x gall solution (20% solids) 5 Custard 10 parts corn starch, 20 parts glycerin, 20 parts water) 200 Emmple C' Parts Gelatin 150 Water 225 Glycerin 1,550

Petrex resin 30 Ox gall solution (20% s0lids) 0 Example D Parts Gelatin 150 Water 225 Glycerin 1,650

Methyl oleate Ox gall solution (20% solids) 2n 'is the trade name In the above compositions, the term Gluflex is the trade name for an 80% invert sugar solution made by the Numolin Co. -The term Hercolyn for dihydromethylabietate, made by the Hercules Powder Company. Petrex is the trade name for a resinous polybasic acid of terpene origin made by the Hercules Powder Company.

In place of the solid animal bile used in the above examples, any of the bile salts mentioned above may be substituted in about half the proportion of the animal bile'with substantially the same results.

All the above compositions are diflicult to bond to a drying oil coated backing without the animal bile or bile salts. All give excellent bond when prepared as above stated.

While there have been shown and described certain embodiments of the invention, it is to be understood that it is capable of many modifications. Changes, therefore, may be made without departing from the spirit and scope of the invention as described in the appended claims, in which it is the intention to claim all novelty inherent in the invention as broadly as possible, in view of the prior art.

I claim:

1. A hectograph blanket comprising a backing.

a gelatinous copy mass comprising gelatin and containing a bile salt, and an intermediate bonding layer comprising a drying oil.

'2. A hectograph blanket comprising a backing, a gelatinous copy mass comprising gelatin and containing an animal bile, and an intermediate bonding drying oil.

3. A hectograph blanket comprising a backing,

ing, and an'intermediate bond layer of a drying oil.

ROBERT w. 'ra'rom.

blanket comprising a fibrous 

